tmp89fm42a TOSHIBA Semiconductor CORPORATION, tmp89fm42a Datasheet - Page 55
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tmp89fm42a
Manufacturer Part Number
tmp89fm42a
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42A.pdf
(431 pages)
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2.3
System clock controller
RA000
Figure 2-10 Level-sensitive Release Mode (Example when the high-frequency clock oscillation
STOP pin
XOUT pin
Note:
Note:
Note:
PINT5:
SINT5:
NORMAL mode
When the STOP mode is released, the warm-up counter source clock automatically changes to the clock that
generated the main system clock when the STOP mode was started, regardless of WUCCR<WUCSEL>.
Even if the STOP pin input returns to low after the warm-up starts, the STOP mode is not restarted.
When the STOP mode is released, the warm-up counter source clock automatically changes to the clock that
generated the main system clock when the STOP mode was started, regardless of WUCCR<WUCSEL>.
Example: Starting the STOP mode from the SLOW mode with an INT5 interrupt
Example: Starting the STOP mode from the NORMAL mode
TEST
J
LD
LD
LD
DI
SET
RETI
LD
LD
DI
LD
(Warm-up time at release of the STOP mode is about 450ms at fs=32.768 kHz.)
(Warm-up time at release of the STOP mode is about 200μs at fc=10 MHz.)
(P0PRD).5
F, SINT5
(SYSCR1), 0x40
(WUCCR), 0x03
(WUCDR),0xE8
(SYSCR1).7
(WUCCR),0x01
(WUCDR),0x20
(SYSCR1) , 0x80
- Edge-sensitive release mode
periodic intervals. This periodic signal (for example, a clock from a low-power con-
sumption oscillator) is input to the STOP pin. In the edge-sensitive release mode, the
STOP mode is started even when the STOP pin input is high
In this mode, the STOP mode is released at the rising edge of the STOP pin input.
Setting SYSCR1<RELM> to "0" selects the edge-sensitive release mode.
This is used in applications where a relatively short program is executed repeatedly at
Confirm by program that
the STOP pin input is low
and start the STOP mode.
STOP
circuit is selected)
mode
Page 36
;To reject noise, the STOP mode does not start
;if the STOP pin input is high.
;Sets up the level-sensitive release mode
;WUCCR<WUCDIV> = 00 (No division) (Note)
;Sets the warm-up time
;450 ms/1.953 ms = 230.4 → round up to 0xE8
;IMF = 0
;Starts the STOP mode
;WUCCR<WUCDIV> = 00 (No division) (Note)
;Sets the warm-up time
;200μs / 6.4μs = 31.25 → round up to 0x20
;IMF = 0
;Starts the STOP mode with the edge-sensitive release mode selected
V IH
The STOP mode is released by the hardware.
Always released if the
STOP pin input is high.
Warm-up
NORMAL mode
TMP89FM42A
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